President Obama and others are demanding that we raise taxes on the “rich,” and two recent academic papers that have gotten a lot of attention claim to show that there will be no ill effects if we do. The first paper, by Peter Diamond of MIT and Emmanuel Saez of the University of California, Berkeley, appeared in the Journal of Economic Perspectives last August. The second, by Mr. Saez, along with Thomas Piketty of the Paris School of Economics and Stefanie Stantcheva of MIT, was published by the National Bureau of Economic Research three months later. Both suggested that federal tax revenues would not decline even if the rate on the top 1% of earners were raised to 73%-83%.

How do they arrive at such high numbers? Alan explains.

The authors arrive at their conclusion through an unusual calculation of the “elasticity” (responsiveness) of taxable income to changes in marginal tax rates. According to a formula devised by Mr. Saez, if the elasticity is 1.0, the revenue-maximizing top tax rate would be 40% including state and Medicare taxes. That means the elasticity of taxable income (ETI) would have to be an unbelievably low 0.2 to 0.25 if the revenue-maximizing top tax rates were 73%-83% for the top 1%. The authors of both papers reach this conclusion with creative, if wholly unpersuasive, statistical arguments.

Is this assumption warranted? Hardly. Alan elaborates, making the same points I’ve made about rich people being different than the rest of us.

But the ETI for all taxpayers is going to be lower than for higher-income earners, simply because people with modest incomes and modest taxes are not willing or able to vary their income much in response to small tax changes. So the real question is the ETI of the top 1%. Harvard’s Raj Chetty observed in 2009 that “The empirical literature on the taxable income elasticity has generally found that elasticities are large (0.5 to 1.5) for individuals in the top percentile of the income distribution.” In that same year, Treasury Department economist Bradley Heim estimated that the ETI is 1.2 for incomes above $500,000 (the top 1% today starts around $350,000).

Alan cites other studies as well, all of which show that Saez, Piketty, Diamond, and Stantcheva, are well outside the mainstream.

For all intents and purposes, they cherry-picked data and made unrealistic assumptions in order to justify class-warfare tax policies.